THE IMPORTANCE OF UNDERSTANDING CONCRETE
Air improves the durability in: environments of freeze/thaw, deicer salts, sulfate (ground water) and alkali reactivity. It also improves the workability of the concrete. The DOT may have certain project specification requirements which require a specific amount of air content at the point of placement or at the discharge end of the pumping.
Air loss can be minimized when pumping by slowing down the “freefall” of the concrete and minimizing the pumping pressure.